Not in the UK alongside British people for sure.

I’m in the same boat but not from Poland and I came over a tad later (12) but I’m also 5 years older.

I don’t actually have an accent inherently but I always use an American one to obscure my country of origin.

It’s really quite a backwards little country and they have an insular culture and hot opinions on ‘de immigants’ amongst other things, they’re just polite enough to keep it to the voting booth most of the time until the the child alcoholism and the FAS kicks in.

They will always see you as defined by your nationality first because to them, it makes you fundamentally different as a person because they themselves are fundamentally defined by their nationality - (you can often tell by how much they rely on this as material for ‘banter’) - rather than how many other people see it - as a random side note of historical background of yet another human on this planet - a citizen of the world if you will.

I recall meeting a friend group of my S.O. who’s been here all her life and went to school with those people and still the occasional joke about her country of origin gets a big laugh, not to mention the only brown person at the table only ever joked and got joked to about being Muslim, it wasn’t offensive or anything, but you’d think the guy was a hardcore religious leader by how much it came up when he seemed like just some guy to me.

They might keep you around to pitch in with a fun fact about Poland (even if you don’t really know any) or say something funny (to them) in your accent/language, but you’ll never be actually British and treated as just another one of the peeps about the place.

Try to surround yourself with other people from diverse backgrounds if you can, which won’t be possible in the norf (idk about Wales, never been) but you can definitely do this in London as British people are far and few between and so long as you steer clear of other majorly represented insular ethnic groups you can maybe find a multinational clique or what I had more luck with - an eastern european one with similar levels of integration and shared interests etc., and maybe consider living or visiting elsewhere, like the US which is far more diverse and your background matters far less.

Hope this helps.